Extract or mount your rootfs to a dir. For example: ./rootfs
Install qemu-user-binfmt.
This package will tell kernel run arm ELF with qemu-user.
sudo apt install qemu-user-binfmt
To see what are installed:
ls /proc/sys/fs/binfmt_misc/
cat /proc/sys/fs/binfmt_misc/qemu-arm
Now, we can find that the interpreter of arm ELF is changed to /usr/bin/qemu-arm-static.
The interpreter could be /usr/bin/qemu-arm depending your installation order of QEMU packages.
When we call chroot, kernel will use the interpreter to run ELFs. So we need put qemu-arm-static into the chrooted "root".
If your interpreter is /usr/bin/qemu-arm-static:
cp `which qemu-arm-static` ./rootfs/usr/bin/
If your interpreter is /usr/bin/qemu-arm:
cp `which qemu-arm-static` ./rootfs/usr/bin/qemu-arm
OK, we can chroot now.
chroot ./rootfs/ /bin/ash
Enjoy!
